The government-ordered report into the scandal found contributors to a WhatsApp group suggested that both the Woolwich killing of Drummer Rigby and the Boston marathon bombings were fakes.

The messages included one, posted two days after Drummer Rigby's murder, which contained a YouTube link and the comment: "ATTACK ON ISLAM! Plz watch and share ASAP before they remove it!!!!! London butcher incident; It's is a hoax And this is the link to reveal it."

Another, four days after the Boston bombing, said: "Watch PROOF! Boston Marathon Bombing is Staged Terror Attack on YouTube."

Peter Clarke's report said the WhatsApp group, called the Park View Bortherhood , contained more than 3,000 postings between April 2013 and March 2014, with "core contributors" identified as teachers at Park View School, or other schools within the Park View Educational Trust.

Mr Clarke said the group was set up by Park View's acting principal Monzoor Hussain, and Razwan Faraz - a former teacher at the school - was said to be one of the two "most prolific" contributors.

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Inquiry: Peter Clarke

Most of the messages were found to be "innocuous and often mundane", but others revealed scepticism about the terror attacks, and attitudes towards education, homosexuality and gay marriage.

In May last year Mr Faraz allegedly posted a link to a news article about gay marriage followed by the message: "These animals are going out full force. As teachers we must be aware and counter their satanic ways of influencing young people."

Two discussions revealed "disparagement" of British armed forces, the report said, with one in May last year triggered after a group member posted a link to an article about a Birmingham mosque raising funds for the Help for Heroes charity.

Teacher M wrote: "How about a fundraiser to equip the soilders (sic) with more condoms so they don't leave our sisters pregnant after ravaging them!"

Speakers mentioned in the WhatsApp exchanges also included one who reportedly advocated wife beating and another said to have called on God to "destroy the enemies of Islam".

Mr Clarke's report said: "The contributions, in terms of links to both news items and images, are overwhelmingly anti-Western, anti-American and anti-Israeli."

He went of to add that the "only possible conclusion" from an analysis of the participants in "particularly inappropriate" discussions "is that intolerant attitudes are deeply embedded within a significant number of staff at the Park View Educational Trust".

"The only sensible and appropriate conclusion is that Mr Hussain and his associates who display such intolerant attitudes are not representative of the communities whose children they teach."

Mr Hussain confirmed that he set up the forum but said the purpose was solely to discuss items that could be included in school assemblies, Mr Clarke said.

When interviewed Mr Hussain said he closed down the group because of some of the comments being posted, adding that he "didn't want to start creating animosity between people".